Confirmation needed. Piety appears to be two times the square root of mana spent, rounded down.

Conversion

Followers of Tikki Tooki may convert their religion to Mystera Annur at the cost of piety. The hero will keep any bonuses or penalties bestowed upon him by Tikki Tooki, but will not trigger Mystera Annur's immediate effects as described above. You may convert by visiting Mystera's altar and asking to convert:

Religion

Mystera Annur is the goddess of the Arcane, and the most ardent supporter of magic. She does not look favorably on physical combat, waste of magic, or the destruction of magical creatures.

The following actions will only change your Piety while worshiping Mystera Annur. If you have not yet converted to Mystera, or have renounced your religion, you may perform these actions without triggering the listed effects.

Gaining Piety

Mystera Annur will increase your Piety for performing the following actions:

Use any Glyph: +1 Piety.

The use of any Glyph, regardless of its type, Mana Cost or circumstance, will earn you one point of Piety from Mystera Annur.

The BLUDTUPOWA Glyph does not trigger this effect when activated or deactivated.

Glyphs whose activation fails (as long as you have sufficient mana to use them) will still trigger this effect, despite the "failure" not costing you any mana! Most prominently, casting IMAWAL on a Boss monster is illegal, and so will fail in this manner. As a result, it can be cast infinitely on a Boss for no Mana Cost, no effect, and a piety gain of +1 per use. Note: This trick does not work in the HTML5 version!

Losing Piety

Mystera Annur will decrease your Piety for performing the following actions:

Convert a Glyph: -10 Piety.

Converting any Glyph while Mystera Annur is worshiped will cause an instant decrease of 10 Piety points.

For this reason, any unwanted Glyphs should be converted BEFORE joining Mystera's religion. Glyphs converted before joining do not incur this penalty.

Finish off a monster with a Physical Melee attack: -1 Piety.

If the last hit to kill a monster came from your hero's Physical attack, Mystera Annur will reduce your Piety by 1 point.

This effect only triggers on the last hit that kills a monster, and will only trigger if your hero is using Physical attacks. BURNDAYRAZ is considered a Magical attack, and so it is possible to hurt the monster physically and then finish it off with a fireball without triggering this effect.

Extra damage caused by Mana Shield counts as a Magical attack. Therefore, if your Melee attack dropped the enemy to a low enough level but the Mana Shield damage is what finishes the monster off, this effect is not triggered.

If your Melee attacks are magical (through the effect of an item or Half-dragon), this effect is still triggered.

Finish off a monster that uses Magical attacks with a Physical Melee attack: -4 Piety.

If the last hit to kill a monster came from your hero's Physical attack, and the monster possesses the ability of Magical attacks on its own (see Dragonspawn, Warlock and others), Mystera Annur will reduce your piety by 4 points.

This effect is cumulative with the -1 piety loss caused by killing monsters with Physical attacks (see above). Therefore, killing a Magical creature in this way will lose you a total of 5 points: 1 for killing the monster, and 4 for killing a Magical monster.

This effect only triggers on the last hit that kills a monster, and will only trigger if your hero is using Physical attacks. BURNDAYRAZ is considered a Magical attack, and so it is possible to hurt the monster physically and then finish it off with a fireball without triggering this effect.

Extra damage caused by Mana Shield counts as a Magical attack. Therefore, if your Melee attack dropped the enemy to a low enough level but the Mana Shield damage is what finishes the monster off, this effect is not triggered.

If your Melee attacks are magical (through the effect of an item or Half-dragon), this effect is still triggered.

Retribution

If you commit a travesty against Mystera Annur that will cause your Piety to drop below 0, Mystera will curse you by lowering the effectiveness of all your Glyphs.

Research info required: Does this only affect the damage inflicted by BURNDAYRAZ? What about Glyphs that give a constant, on/off effect like CYDSTEPP?

In the Alpha Version v0.2 there seems to be a bug: After getting your piety below zero, the effect ist that any enemy gets First Strike, as if you pissed off Tikki Tooki (which isn't that bad, since if you're playing on Fireballs it doesn't concern you much).

Research info required: I had this with a Gnome Sorcerer while finishing the Factory, and never noticed a weaker BURNDAYRAZ after going below zero, but afar from this try I never noticed if my enemies got First Strike before the named situation.

Boons

Mystera Annur has 5 boons to offer to her worshipers at the cost of Piety.

Magic

The extra 15 points are not filled immediately. You will need to find a way to replenish those points yourself (such as exploration or a Mana Potion).

Faith

Using Glyphs will earn you +2 piety instead of +1.

Costs 20 Piety.

After this boon has been acquired, and as long as you keep worshiping Mystera Annur, each use of a Glyph as explained above in the section "Gaining Piety" will earn you +2 Piety points instead of +1 as normal. There are no other effects to this boon.

Flames

The damage inflicted by BURNDAYRAZ is increased by 25%.

Costs 50 Piety.

Once this boon has been acquired, each casting of BURNDAYRAZ will inflict 25% more damage on the targeted monster than before.

This effect is cumulative: if you have already acquired an increase to the power of BURNDAYRAZ (through Items or any other means), the effects will add up. For instance, if your fireballs already cause 50% more damage than normal before acquiring this boon, they will cause 75% more than normal with this boon.

The Mana Cost of using BURNDAYRAZ does not change as a result of this effect.

Weakening

All monsters lose their entire Magical Resistance, if they had any.

Costs 100 Piety.

On acquiring this boon, all monsters in the dungeon that have any Magical Resistance will lose their Magical Resistance entirely.

This means that spells and Magical attacks (including BURNDAYRAZ, Mana Shield, and Magical Melee attacks) will cause normal damage to these monsters instead of the previously reduced amount.

Strategy

Mystera's cost for worshiping makes her unsuited for all but the most magic-focused of classes. For most players, this means Wizards and Bloodmages. Additionally, the slow rate of piety gain with her means that any glyphs you want to convert under her should be done before joining. On the upside, you can get plenty of piety upon worship, enough to get whatever boons you may decide you need. Weakening, while powerful for pure casters, is very situational (usually only of use against the Iron Man) and the high cost usually means that casters should find alternative methods of handling that particular situation aside from worshiping Mystera. Magic and Flames are both key boons, allowing you to deal a lot more damage with just BURNDAYRAZ alone. If there's still plenty more casting to be done in the dungeon, consider using your starting piety on the Faith boon and working your way up to Magic and Flames.

Two oddities of note to help players circumvent Mystera's penalty for joining. First, it is possible, although very expensive, for followers of Tikki-Tooki to convert to Mystera. If you're playing a pure caster (or even a hybrid), you should have no trouble gaining piety under Tikki-Tooki. In fact, Rogues can gain piety quickly under Tikki-Tooki, but have little benefit from his boons, so they're well-suited to this option. Second, Mystera's penalty has no effect on the Assassin's Swift Hand ability, meaning they can still instantly kill lower-leveled enemies with their physical attack, although this comes with piety loss.

Another option for worshiping Mysteria is to wait until the very end of the game, after expending all your healing potions. At this point, you can worship Mysteria and should have enough piety to purchase the Magic boon. If you've saved up all your mana potions, the extra mana should give you the edge to BURNDAYRAZ the remainder of the boss's hit points. The loss of damage is irrelevant since you're out of hit points and couldn't attack anyways.

Specific Races

This article is missing some information that requires research to explain, please consider adding to it